XPS 13 9343 Green and Red Dots On External Screen

Hi all,
My xps is connected to a DELL P2314H External Screen.
In some cases, (mostly when the pc is waking from a sleep mode) I have green and red dots on my external screen (but not on my laptop screen). When I disconnect and reconnect the cable they disappear.
I couldn't manage to diagnose what is causing the problem. The things I did try are:
1. Changing the cable.
2. Reinstalling drivers.
3. I've updated to the new A07 BIOS.
Non of these helped... I tried get that problem to appear with a different screen connect to my pc as well as a different laptop (with same cable) to my external screen. In both cases the problem didn't appear.
What do you guys think?

Thanks,
Asaf.

 

I wouldn't worry about it too much. I've seen similar things with digital connectors (HDMI, DisplayPort, etc) for laptops that wake-from-sleep, or when you change monitor outputs (e.g. laptop only, duplicate screens, extend desktop).

I can't say specifically what the problem is in your case. But in my situation, there wasn't proper handshaking over HDMI when the laptop would wake from sleep. As a result, the data being sent over the HDMI connection was out-of-sync, and would display as snow / garbage on the screen. To fix it, I would either re/plug the cable back in, reboot the laptop, or turn off/on the external display I was using. Any of those would force an HDMI handshake, and fix the problem.

Try turning your monitor off/on when that happens again, and seeing if it works. Otherwise, you're pretty much stuck with unplugging the cable as a workaround until some driver update patches this out.

Look at the bright side: In the grand scheme of things that could go horrifically wrong with computers, this one ranks pretty low. It's just a mild inconvenience that you can work around; rather than being a grand clusterf*** that screws everything up.

 

First of all - thanks!
So as I understand what you're saying, you don't think it has something to do with hardware?

Another relevant question,
Should I install drivers from dell.com support page? or is it better to go to the most updated intel 5500 graphic driver from intels site?

 

Go to intel's page and get drivers from there.

 

So yes, you were right - it works if I turn my monitor off/on. Does it mean that the problem is in the monitor? and not my pc?
I've called dell and they offered to replace my system board.
What do you think?

Thanks.

 

Its hard to say what the problem is. Most likely an issue with the way that your laptop is configured to handle wake-from-sleep.

Replacing hardware won't do anything. It is a software (driver) issue. It may never get fixed, because it could be just a quirk between the exact configuration of laptop, driver, HDMI cable, and monitor you are using.

Honestly, its inconvenient, but its not earthshattering. I'd just live with it.

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